<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .father  {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 600px;
            height: 300px;
            background-color: orangered;
        }
        .child:first-child {
            /* flex-grow: 1;
            flex-shrink: 1;
            flex-basis: 0%; */
            width: 100px;
            height: 30px;
            align-self: flex-start;
            background-color: skyblue;
        }
        .child {
            width: 400px;
            height: 30px;
            flex-shrink: initial;
            /* align-self: flex-start; */
            background-color: skyblue;
        }
    </style>
</head>
<body>
    <div class="father">
        <div class="child"></div>
        <div class="child"></div>
        <div class="child"></div>
    </div>
</body>
</html>